Multiply or divide and leave the answer in trigonometric notation.7(cos 39° + i sin 39°) ? 3(cos 16° + i sin 16°)
A. 10(cos 55° + i sin 55°)
B. 10(cos 264° + i sin 264°)
C. 21(cos 55° + i sin 55°)
D. 21(cos 23° + i sin 23°)
Answer: C
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Write a chain rule formula for the following derivative.
for w = f(x, y, z); x = g(r, s, t), y = h(r, s, t), z = k(r, s, t)
A. 
= 
+ 
B. 
= 
+ 
+ 
C. 
= 
+ 
+ 
D. 
= 
+ 
+ 
Calculate the derivative of the function. Then find the value of the derivative as specified.
t =1 if r = 
A. 
= - 
; 
t =1
= - 
B. 
= 
; 
t =1
= 
C. 
= - 
; 
t =1
= - 
D. 
= 
; 
t =1
= 
Find the mode or modes.The table shows the country represented by the winner of the 10,000 meter run at a certain international competition in various years.YearCountry2001F2002F2003F2004F2005 P2006F2007C2008C2009R2010R2011U2012K2013F2014F2015E2016I2017M2018MFind the mode of the country data.
A. M B. F C. R D. C
Solve the equation.7x = 12
A. 
B. 
C. 
D. 